1-4 HN4000 Metro Ethernet Copper Access Switch Overview
HN4000 Hardware Installation Guide 920550-5020 Rev 14
AsshowninFigure 1‐3,theHN4000switchhasthefollowingmajorcomponents:
❒ mainchassis
❒ CoolingUnitmodule
❒ field‐replaceablehigh‐speednetworkmodule
Figure 1-3 Annotated Front View of HN4000 Equipment (HN4000e Shown)
1.3.1 HN4000 Main Chassis
TheHN4000mainchassisisthepowersourceforthecircuitcardsandtheHN4000Cooling
Unit.
1.3.2 HN4000 Cooling Unit Module
TheHN4000canbeorderedwithasideair‐exhaustoptionorwitharearair‐exhaustoption.
(ThesameCoolingUnitmoduleworkswithbothair‐exhaustlocations.)
TheHN4000CoolingUnitmodulecontainsthreetemperature‐controlledfansandanair‐filter
assembly.AnHN4000’sCoolingUnitmodulecanbe
replacedwithoutserviceoutage.
Table 1-1 HN4000 Main Chassis Size and Weight
HN4000 Main Chassis
Dimensions Height:1.72”(44mm)
Width:17.45”(444mm)
Depth:9.88”(19”and23”racks,w/ocables);251mm
(ETSIracks/cabinets,w/ocables)
Weight 11lbs(5kg)
Universal I/O Slot for field
replaceable high-speed
network module with dual-
redundant ports
Modular, field
replaceable cooling
unit
Main chassis